JPS6236362Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a control device for use in a clock radio receiver, etc., and aims to provide an excellent control device with a simple configuration.

Generally, when controlling the radio receiving circuit on and off in a radio receiver with a clock, the configuration as shown in FIG. 1 is often used. That is, in FIG. 1, 1 is a clock circuit driven by a power source 2, which outputs a control signal from an output terminal a at a preset time. 3 is clock circuit 1
4 is an on/off/auto changeover switch in which the auto terminal C is connected to the output terminal a and the on terminal I is connected to the common positive side of the power supplies 2 and 5; Terminal RO is open. The movable contact piece of the on/off/auto changeover switch 4 is connected to the base of a transistor 7 via a resistor 6, and the collector of the transistor 7 is connected to the base of a control transistor 9 connected in series to a radio receiving circuit 8. It is connected. In addition, 10
is a resistor connected to the emitter of transistor 7.

In the conventional clock radio receiver shown in FIG. voltage is applied, and the radio receiving circuit 8 becomes operational. Then, when the on/off/auto changeover switch 4 is turned to the off terminal (low), both the transistors 7 and 9 are turned off, and the radio receiving circuit 8 becomes inactive.

On the other hand, if the on/off/auto changeover switch 4 is connected to the auto terminal C, the transistors 7 and 9 will be turned on only when a control signal appears from the clock circuit 1, and at this time the radio receiver will operate. become a state.

In this way, even in the conventional radio receiver with a clock shown in FIG. 1, it is possible to control the radio receiving circuit 8 on and off as desired by operating the on/off/auto changeover switch 4. In the conventional clock radio receiver shown in FIG. 1, power supply voltage is applied to the radio receiving circuit 8 via the transistor 9 even when the on/off/auto changeover switch 4 is turned on to the on terminal A. There was a problem in that the output of the radio receiving circuit 8 decreased due to the loss caused by the transistor 9.

The present invention eliminates the above-mentioned conventional drawbacks and provides an excellent control device with a simple configuration.

The control device of the present invention will be described below with reference to drawings of an embodiment. In FIG. 2, the same reference numerals as in FIG. 1 indicate the same components as in FIG. The difference from Figure 1 is that on,
off, auto changeover switch 4 and at least 5
A one-circuit changeover switch having three fixed contacts D, E, H, G, and G is used, with the first fixed contact D connected to the common positive side of the power supplies 2 and 5, and the second fixed contact E connected to the transistor 7. At the base of That's what I did.

In the above embodiment, the movable contacts of the on/off/auto changeover switch 4 are connected to the first,
If the third fixed contact 2 and 3 are short-circuited, the power supply voltage in the radio receiving circuit 8 is
The radio receiving circuit 8 operates at a high output.

Then, the movable contact piece connects the second and fourth fixed contacts Ho,
When the circuit 1 is short-circuited, the output of the clock circuit 1 is applied to the base of the transistor 7 via the fourth and second fixed contacts G and E, and a control signal is output from the clock circuit 1. At this time, transistors 7 and 9 are turned on, and power supply voltage is applied to radio receiving circuit 8 via transistor 9.

Furthermore, when the movable contact piece short-circuits between the third and fifth fixed contacts, the connection point between the base radio receiving circuit 8 of the transistor 7 and the transistor 9 is both opened, and the radio receiving circuit 8 No power supply voltage is applied to the device, and it is in a non-operating state.

In this way, according to the above embodiment, on, off,
When auto changeover switch 4 is on,
The power supply voltage is directly applied to the radio receiving circuit 8 via the off/auto changeover switch 4, and the power supply voltage is applied to the radio receiving circuit 8 via the transistor 9 only in the auto state. Therefore, according to the above embodiment, at least in the on state, there is no loss due to the transistor, and the power supply voltage is directly applied to the radio receiving circuit, so that the radio receiving circuit operates with high efficiency.

In the embodiment, a radio receiver with a clock has been described, but a control signal generation circuit that outputs other control signals is used in place of the clock circuit, and another load is connected in place of the radio reception circuit. It is also possible to do so.

As detailed above, according to the present invention, the first to
It has the advantage that each of the on, off, and auto functions can be configured in one circuit by using a sliding type switch having a fifth fixed contact. Further, since the ON function is to directly supply power to the load without going through a transistor, there is no loss due to the transistor, and the load can be driven with high efficiency. Furthermore, since the switch does not have a common fixed contact but each has independent first to fifth fixed contacts, the switch has the advantage of a simple structure.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a clock radio receiver using a conventional control device, and FIG. 2 is a block diagram of an embodiment of the control device of the present invention. 1... Clock circuit, 2, 5... Power supply, 3... Time display section, 4... On, off, auto changeover switch, 6, 10... Resistor, 7, 9... Transistor, 8... Radio reception circuit.

Claims (1)

[Scope of utility model registration request] Connect the control terminal of the control transistor connected in series to the load to the second fixed contact of the on/off/auto changeover switch, and connect the control terminal of the control signal generation circuit to the fourth fixed contact of the changeover switch. and connecting a connection point between the load and the control transistor to a third fixed contact of the changeover switch,
When the changeover switch is in the on position, the movable contact connects the first fixed contact and the third fixed contact of the changeover switch connected to the power source to directly supply the power supply voltage to the load. When the changeover switch is in the auto position, the second
A movable contact piece connects the fourth fixed contact to supply power supply voltage through a control transistor, and when the changeover switch is in the OFF position, the changeover switch is in the open state, and the fifth fixed contact and the third A control device characterized in that a movable contact piece establishes conduction between the fixed contacts of the controller and cuts off power supply to the load.